<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <link href="index2.css" rel="stylesheet" type="text/css">
</head>
<body>
  <P><strong>p标签hello Css</strong></P>
  <ul>
      <li><strong>li标签:Hello css</strong></li>
  </ul>
</body>
</html>